diff --git a/IkiWiki.pm b/IkiWiki.pm
index bf4a0d415..e1c4b6e2f 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -1045,7 +1045,7 @@ sub preprocess ($$$;$$) { #{{{
 		my $params=shift;
 		$params="" if ! defined $params;
 
-		f (length $escape) {
+		if (length $escape) {
 			return "[[$prefix$command $params]]";
 		}
 		elsif (exists $hooks{preprocess}{$command}) {